| Measurements of inner and outer streaming vortices in a standing waveguide using laser doppler velocimetry. | |
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MedLine Citation:
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PMID: 18247868 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Measurements of the axial streaming velocity are performed by means of laser doppler velocimetry in an experimental apparatus consisting of a waveguide having loudspeakers at each end for high intensity sound levels. Streaming is characterized by an appropriate Reynolds number Re(NL), the case Re(NL)<<1 corresponding to the so-called slow streaming and the case Re(NL)>/=1 being referred to as fast streaming. The variation of axial streaming velocity with respect to the transverse coordinate is compared to the available slow streaming theory. Streaming fluid flow is measured both in the core region and in the near wall region. Streaming velocity in the center of the guide agrees reasonably well with the slow streaming theory for small Re(NL) but deviates significantly from such predictions for Re(NL)>20 and its evolution for further increasing Re(NL) is discussed. Then streaming behavior in the near wall region is particularly studied. For Re(NL)<70, two vortices are present across the guide section as predicted by slow streaming theory. Then it appears that, when the Reynolds number is increased, two other vortices become visible in the near wall region. Different stages for the generation and evolution of these inner streaming vortices are presented. |
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Authors:
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Solenn Moreau; Hélène Bailliet; Jean-Christophe Valière |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 123 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-02-05 Completed Date: 2008-03-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 640-7 Citation Subset: - |
Affiliation:
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Laboratoire d'Etudes Aérodynamiques, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, 86022 France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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